Medical/Healthcare:
* Physician Assistant: A healthcare professional who practices medicine under the supervision of a physician.
* Personal Assistant: Someone who assists an individual with personal or professional tasks.
Other:
* Public Address: A system used for making announcements or providing information to a large group of people.
* Power Amplifier: An electronic device that amplifies an audio signal.
* Pennsylvania: A state in the United States.
* Political Action: A term used to describe political activities by individuals or groups.
* Per Annum: Latin for "per year", often used in financial contexts.
* Post-Anesthesia: Refers to the period of time after a patient has undergone anesthesia.
To know the exact meaning of "PA" in a specific situation, you need to consider the context in which it is used.